Keynes argued that there are no endogenous mechanisms that moves the economy back into full employment long run equilibrium. Do you agree with Keynes's argument? Justify your answer.

It can be argued that a lack of aggregate demand can keep unemployment high for a long period of time without policymakers’ intervention, as the economy does not automatically return to full employment on its own. Firstly, total demand in the economy, such as spending by government, firms, and households, may not be strong enough […]